Mähringer Andre, Rotter Julian M, Medina Dana D
Department of Chemistry, Ludwig-Maximilians-Universität (LMU), Butenandtstr. 11, 81377 Munich, Germany.
Nanosystems Initiative Munich (NIM) and Center for NanoScience (CeNS), Schellingstr. 4, 80799 Munich, Germany.
Beilstein J Nanotechnol. 2019 Oct 9;10:1994-2003. doi: 10.3762/bjnano.10.196. eCollection 2019.
We report on the synthesis of highly oriented and nanostructured metal-organic framework (MOF) films featuring extreme surface wetting properties. The Ni- and Co- derivatives of the metal-catecholate series (M-CAT-1) were synthesized as highly crystalline bulk materials and thin films. Oriented pillar-like nanostructured M-CAT-1 films exhibiting pronounced needle-like morphology on gold substrates were established by incorporating a crystallization promoter into the film synthesis. These nanostructured M-CAT-1 MOF films feature extreme wetting phenomena, specifically superhydrophilic and underwater superoleophobic properties with water and underwater oil-contact angles of 0° and up to 174°, respectively. The self-cleaning capability of the nanostructured, needle-like M-CAT-1 films was illustrated by measuring time-dependent oil droplet rolling-off a tilted surface. The deposition of the nanostructured Ni-CAT-1 film on a large glass substrate allowed for the realization of an efficient, transparent, antifog coating, enabling a clear view even at extreme temperature gaps up to ≈120 °C. This work illustrates the strong link between MOF film morphology and surface properties based on these framework materials.
我们报道了具有极端表面润湿性的高度取向和纳米结构的金属有机框架（MOF）薄膜的合成。合成了金属邻苯二酚系列（M-CAT-1）的镍和钴衍生物，作为高度结晶的块状材料和薄膜。通过在薄膜合成中加入结晶促进剂，在金基底上制备了具有明显针状形态的取向柱状纳米结构M-CAT-1薄膜。这些纳米结构的M-CAT-1 MOF薄膜具有极端的润湿性现象，特别是超亲水性和水下超疏油性，水和水下油的接触角分别为0°和高达174°。通过测量倾斜表面上随时间变化的油滴滚落情况，展示了纳米结构的针状M-CAT-1薄膜的自清洁能力。在大型玻璃基板上沉积纳米结构的Ni-CAT-1薄膜，实现了一种高效、透明的防雾涂层，即使在高达约120°C的极端温度差下也能保持清晰的视野。这项工作阐明了基于这些框架材料的MOF薄膜形态与表面性质之间的紧密联系。
